Marcus Caelius Rufus
an orator and politician in the late Roman Republic.
He was born into a wealthy equestrian family from Interamnia Praetuttiorum , on the central east coast of Italy. He is best known for his trial for public violence in March 56 BC, when Cicero defended him in the extant speech Pro Caelio, and as both recipient and author of some of the best-written letters in the ad Familiares corpus of Cicero's extant correspondence. He may be the Rufus named in the poems of Catullus